Wolfram Alpha
I tried Wolfram alpha for the first time today. I was pleased that it handled some mathematical queries without any special syntax. I asked Fourier transform of absolute value. It worked by I just tried it again and it timed out. Typing names of various chemicals was informative. Other information it gives was found to be inaccurate. For example it thinks The University of Manchester was founded in 1851. Take your pick from 1824 or 2004, but 1851 is just wrong. Source information is given, but it does not reference each fact separately so one cannot tell where they gone wrong. It seems they have used sources uncritcally without checking, or perhaps used out of date information (for example 1851 is probably listed as the founding date of the old Victoria University of Manchester, pre 2004). There is a feedback form but no reaction yet.
I also tried a fish Gnathonemus petersii. It got the common name wrong "Peter's elephantnose fish" instead of the correct "Peters' elephantnose fish". A look at the Latin name reveals that it is clearly named after Peters. A common mistake on the internet, but a glance at Wikipedia would have sorted them out!
So overall I am sure I will use it and it will develop. But without properly verifiable references it is less trustworthy than a well referenced Wikipedia article.
I also tried a fish Gnathonemus petersii. It got the common name wrong "Peter's elephantnose fish" instead of the correct "Peters' elephantnose fish". A look at the Latin name reveals that it is clearly named after Peters. A common mistake on the internet, but a glance at Wikipedia would have sorted them out!
So overall I am sure I will use it and it will develop. But without properly verifiable references it is less trustworthy than a well referenced Wikipedia article.